[flow_analysis] Refactor unit tests to use explicit PreIncDec node. Previously, the mini_ast used for flow analysis testing simulated prefix increment/decrement operations using a `Write` node with a null right-hand side. This commit introduces a dedicated `PreIncDec` node to represent these operations more accurately. The test "write() permits expression to be null" is removed in favor of two new tests: - "preIncDec() stores expressionInfo in the write" - "preIncDec() demotes to the written type" These new tests parallel the corresponding tests that already exist for postIncDec. Change-Id: I6a6a69646c63ca1c605272d4170eae3729ce90e1 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/482560 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
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